N°880: fix the bugfix [r5737]

- previous bugfix altered the cron frequency, this is not the desired behaviour, now the conf alter the lifetime of drafts's attachments
- apply for both inline images and attachments

SVN:trunk[5795]

datamodels/2.x/itop-portal-base/portal/src/controllers/objectcontroller.class.inc.php

@@ -1455,7 +1455,7 @@ class ObjectController extends AbstractController
 					{
 						$oDocument = utils::ReadPostedDocument($sFieldName);
 						$oAttachment = MetaModel::NewObject('Attachment');
-						$oAttachment->Set('expire', time() + 3600); // one hour...
+						$oAttachment->Set('expire', time() + MetaModel::GetConfig()->Get('draft_attachments_lifetime')); // one hour...
 						$oAttachment->Set('temp_id', $sTempId);
 						$oAttachment->Set('item_class', $sObjectClass);
 						$oAttachment->SetDefaultOrgId();